Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8f2659cd48f659…

MALICIOUS

PDF

45.4 KB Created: 2020-08-09 13:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 140949cee853c55ca9276f96617b0c10 SHA-1: cd241214ee4715be50d7ca486a801ca19a6ec6f6 SHA-256: 5b8f2659cd48f659efe4e6f05bb8c1be5800a6ad4e0a94105b4dce4c2028b93a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with the primary URL identified as a malicious redirector. This suggests the document is designed to direct users to harmful sites, potentially for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=accidentes+laborales+en+chile+2020+pdf
    • http://files.livelifewelltherapy.com/uploads/1/3/0/8/130874433/8199104.pdf
    • http://files.johnmjoysolicitors.com/uploads/1/3/0/7/130776864/b6c88575862.pdf
    • http://files.thepaganpicnic.com/uploads/1/3/1/3/131398117/756800.pdf
    • http://files.lazarusvintagerevival.com/uploads/1/3/1/4/131454459/xuwizageto.pdf
    • http://kugax.kahurangiwalks.co.nz/uploads/1/3/2/8/132814930/9032487.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/3587/2667/files/artificial_intelligence_trends_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/buganujegusupuzibubotiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/3214355751.pdf
    • https://cdn.shopify.com/s/files/1/0432/2118/8763/files/energias_alternativas_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0428/5841/4236/files/honda_goldwing_gl1800_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/15244418222.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/woxotiwefuxefakagezelerub.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7913/files/polap.pdf
    • https://cdn.shopify.com/s/files/1/0432/7522/3200/files/boyds_bears_value_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dogazuzotefoninu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/41449737914.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9667/files/sajofarel.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2184/files/like_water_for_chocolate_book_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fa5.bin
b1059b761722804534faf45550df96981767b358a89698ef74667811ce9adc5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA5 5648 bytes
font_01_sfnt_off000082d5.bin
a9db9428f1539b1f9983e35706cfb0a727fffd62afc87ee3c51b94fff3c850fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D5 11036 bytes

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